On Thu, 29 Aug 2019 15:21:20 +0100, "Commander Kinsey"
wrote:
snip

I've had files corrupted which were being written to when a powercut occurred. Therefore I got a UPS and have never experienced the same again. I then realised since the UPS has much more output than the computer needed, I could run my lighting circuit off it aswell. My LED bulbs now last 5 years instead of 6 months. It not only removes spikes, surges, and brownouts, but it will adjust the voltage when it's wrong.

Can that not depend on the UPS though? Some do provide some passive
filtering but only produce any output themselves when the power fails
('Offline').

Others are more as you describe where they are maintaining the output
themselves all the time and so can do as you say ('Online').

I believe there are pros and cons to both types. Offline consume less
energy as all they need to do is keep the battery trickle charged and
switch to the inverter output when required. There can be a switchover
delay and some equipment can be sensitive to this.

So, given that many old UPS's don't produce a very clean (non sine
wave) output, Offline UPS's can be better long term as they only
subject the equipment to such when they are called for (the equipment
running directly from the mains till that happens).

Later UPS's may produce a cleaner, more sinusoidal output etc.

Cheers, T i m